| Pontneddfechan to Joliet (Illinois) | 3,843.73 mi (6,185.88 km) |
| Pontneddfechan to Jonesboro (Arkansas) | 4,213.30 mi (6,780.65 km) |
| Pontneddfechan to Joplin (Missouri) | 4,301.12 mi (6,921.98 km) |
| Pontneddfechan to Joppatowne (Maryland) | 3,467.02 mi (5,579.63 km) |
| Pontneddfechan to Juana Díaz (Puerto Rico) | 4,093.54 mi (6,587.92 km) |
| Pontneddfechan to Junction City (Kansas) | 4,294.07 mi (6,910.64 km) |
| Pontneddfechan to Juneau (Alaska) | 4,332.28 mi (6,972.13 km) |
| Pontneddfechan to Jupiter (Florida) | 4,217.50 mi (6,787.40 km) |
| Pontneddfechan to Jupiter Farms (Florida) | 4,221.88 mi (6,794.46 km) |
| Pontneddfechan to Jurupa Valley (California) | 5,293.90 mi (8,519.70 km) |
| Pontneddfechan to Justice (Illinois) | 3,820.96 mi (6,149.25 km) |
| Pontneddfechan to Kahului (Hawaii) | 7,157.35 mi (11,518.63 km) |
| Pontneddfechan to Kailua (Hawaii) | 7,146.27 mi (11,500.82 km) |
| Pontneddfechan to Kalamazoo (Michigan) | 3,710.10 mi (5,970.84 km) |
| Pontneddfechan to Kalispell (Montana) | 4,416.77 mi (7,108.10 km) |
